Brake mechanism



June 27, 1933. J. w. WHITE BRAKE MECHANISM Filed June 12, 1929 J HNWLLIAM WHlTE Patented June 27, 1933 UNITED, STATES PATENT oFFicEf JOHNWHITE, 01 BUFFALO, NEW YORK BRAKE ivrnonanisivr Application filed June12,

provide a brake of the singleshoe type having a minimum number of partsand in which the brake band is positively anchored at one end'onlynAnother object of this invention is to provide in the brake an anchorwhich is rigidly secured to one end of the brake band, the other endbeing free and which functions as a support for the freeend of the brakeband. A further object of this inventionis to provide a brake of thesingle shoe type in which the brake band is applied by a single radiallymoving element attached to one end'the'reof andis withdrawn from thefunctioning position by the action of such element and of meanslocatedsubstantially diametrically opposite the element. V

' Other objects of the invention will appear to one skilled in the artfrom the following specification taken in connection with the drawingforming a part thereof and in which Fig. 1 is a side elevation of abrake mechanism embodying this invention, certain parts being brokenaway for the purpose of clarity; and

Fig. 2 is a brake mechanism showing such mechanism mounted up'ona wheelof the airplane type.

In the drawing, the reference numeral designates a brake drum having abraking surface 11 and suitably secured in any desired manner to therotating part of a wheel. In the embodiment illustrated in the drawingthe drum lOis secured to the hub 12 0f a wheel of the airplane type bymeans of a pair of braces'13. 'Mounted upon the axle 15 is a brakeflange 16 which acts as a support for the brake applying elements andfor the brake band. It is understood, however, that the presentinvention is by no means limited to this particular use and that a brakemade in accordance with this invention is applicable to any type ofwheel or rotating member and will function to retard a rotatingmovement.

Rigidly secured tothe inner face of the The primary object of thisinvention is to transverse sectional view of such 1929. Serial No.370,170.

brake flange 16 is an angle bracket 17 having a bosslS and a centralopening 19 through whlch extends a rod 20. Attached to the outer end ofthe rod 20 is oneend of an arm 21, the other end carrying a pin 22 whichenters an openingin one end of a link 23. The other end of the link 23engages a stub shaft 24 which is supported by the opposite sides 25 of aU-shaped member 26 preferably i a stamping.

The ends of the brake band 30 are secured by rivets or similar means tothe bracket 17 or brake anchor, and to the member 26 or brake shoe. Theend 31 of the band rests upon the flange 32 of the bracket and the end33 hereinafter designated and referred to as the free end, projectsbeyond the member 26 to such a distance that it rests upon the flangeand, when the parts are in the idle positlon shown in Fig. 1, abuts theend 31. The brake band 30 is preferably providedwith a brakelining 34 ofthe usual type and the bracket 17 is so located that the end 31 of thebrake band secured to the flange 32 is held out of contact with thebraking surface 11 of the drum at all times. vA spring 35 attached atone end to a clip 36 on the brake band and at the other end to the stubshaft 24 normally acts to hold theparts in the idle position shown inFig. 1, in which the end 33 of thei brake band rests against the flange32 of the bracket, the ends of the band 30 abutting and the entire brakelining being out ofcontact with the braking surface 11 of the drumr As ameans for holding the center of the brake band 30 in proper positionthere is rigidly bolted to the flange 16 at a point substantiallydiametrically opposite the bracket -17 apost 88 against which a washer39 is held by a screw 40. A double spring 41 at tached at one end to aclip 42 and at the other endto' a similar clip 43, 'both clips beingcarried by the brake band, is clamped between the washer 39 and post 38,as shown particularly in Fig. 2. The coils 44, 45 of the spring 41 arelocated on opposite sides of the post 38 and function independently butcoact and i normally tend to hold the center of the brake band away fromthe braking surface 11.

A suitable brake lever 46 is attached to the into contact with thebraking surface 11, e-.

ing carried away from the end 31 of the band and the bracket 17.'Assuming'that the Wheel is rotating in the manner indicated by the ar--row 50, it must follow, since the member 26 holds the end of thebandagainstthe bl'flk? ing surface, that the other portions of the brakeband will wrap against the drum until the brake'lining comes intocontact with'the braking surface 11 of the drum throu hout substantiallythe entire length of the brake band. The member 26 pivots on the pin 22andthus permits the necessary longitudinal vmovement of the band. Thiswrapping actionof the brakeband is resisted by the springs and 41, butowing to the urge exerted by the rotating body the spring 35 and coilI44 will expand and permit such movement."

- If'the body be rotated in the direction opposite to that indicated bythe arrow the same function will take place with the exception that thecoil 45 will be placed under tension rather than the coil 44. Thelongitudinal movement of the brake band caused by this action of theband will be limited by the contrast of the ends of the band. As soon,however, as the brake is released the member 26 will be returned to itsnormal position by the lever 46 and spring 35 and the free end 33 of theband will be brought to rest upon the flange 32 with its end in abutmentwith the end 31'. At the same time the coils 44 or I 45 will withdrawthe center of the brake band from any functional contact with the brakedrum.

It will be noted that the member 26 which constitutes the shoe by pliedto the band is ocated adjacent to the anchoring bracket 17 and moves insubstanjv drum havin bracket rig-id y secured withinthe drum havtially aradial direction, the spring 35 counteracting any tendency that might beexerted by the link 22 to move the member in other than a radialmovement. The radial movement of the member 26 is terminated when thelining at the end 33 of the band comes into contact with the brakingsurface, and its operationis the same whether the lining be thin orthick the only difference being that with a thinner lining, the radialmovement of the shoe will be through a longer distance. It will also benotedv that the brake band is of the full floating type anchored at theend 31 alone, and that the anchoring bracket 17 supports both ends ofthe band.

. The member 26 being secured to the free end of the band thusreinforces such end and which pressure is apdistributes the pressurewhen that end of the band is brought into contact with the drum and inplace of the member 26 other forms of reinforcing means might beprovided.

While certain features of this invention have been described in detailit must follow that the other features which are toall intents andpurposes equivalents thereto come within the spirit and scope of theinvention as set forth in the following claims.

I claim:

g 1. A brake mechanism comprising a brake drum, a'brake band within thedrum, an anchor to which one end of the band is secured the other endbeing free, a member pivotally supported upon said anchor and secured tothe band adjacent its free end, the free end of theband resting upontheanchor and abuttingjits other-end when idle and means for causing saidmember to carry the free end of the brake'band radially away from theanchor and into contact with said brake drum.

2. A brake mechanism comprising a brake drum, a brake band locatedwithin the drum having the free end portions thereof located in closeproximity in the released position of the band, means fixed relative tothe drum for supporting the said ends, means for securing one of theends to said supporting means, and means operatively connected to one ofthe ends for. expandingv the band against the braking surface of thedrum.

3. A brake/mechanismcomprising a brake drum having a circular brakeflange, a bracket fixed within the drum having a surface spaced inwardlyfrom the inner surface of thebrake flange and arranged substantiallyconcentric therewith, a brake-band also located within the drum havingthe free ends the bracket in close proximity to each other, means forrigidly securing one of said end portions to the bracket,and meansoperatively connected to the other of said end portions for expandingthe band against the braking surface of the drum. v

4. A brake mechanism comprising a brake a circular :brake flange, a

ing a surface spaced inwardly from the brake flange inconcen tricrelation thereto, a brake band located within the drum having the freeend portions contacting with each other in the released 'position of theband and seated upon the surfaceaforesaid of the bracket, means normallyurgingthe end portions of said band into engagement with each other,means for rigidly securing one of the end portions of the band to thebracket, and means operatively connected to the other end of said bandforexpanding the latter against the brake flange. g i f 5. A brakemechanism comprising a brake drum having a circular brake flange, a

securing one of the ends of the band in overlapping relation with aportion of said surface, and means for expanding the band intoengagement with the brake flange;

Signed by me at Bufialo, New York, this 7th day of June 1929.

JOHN WILLIAM WHITE.

